Originally Posted by
daredevil
It's not a matter of cable adjustment, it's clutch slip and I'm guessing it's common but no everyone experiences it, especially if you sit most the time.
The gear slip is not uncommon on Nexus hubs especially for strong riders. The old Nexus 8 could be torn apart by people who could put a lot of torque into them, but with the newer IGH's like the Alfine, Shimano redesigned the hub and put a "torque limiter" into the hub. You could probably lessen the problem somewhat by exchanging your 22 rear sprocket with the standard 18 tooth sprocket. (I seem to remember that Shimano advice some minimum gearing ratio to avoid torque problems).
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Regards